CN106657827A - Near-infrared system and method for automatically adjusting integral time - Google Patents
Near-infrared system and method for automatically adjusting integral time Download PDFInfo
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- CN106657827A CN106657827A CN201611240454.1A CN201611240454A CN106657827A CN 106657827 A CN106657827 A CN 106657827A CN 201611240454 A CN201611240454 A CN 201611240454A CN 106657827 A CN106657827 A CN 106657827A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/50—Control of the SSIS exposure
- H04N25/53—Control of the integration time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/50—Control of the SSIS exposure
- H04N25/57—Control of the dynamic range
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/30—Transforming light or analogous information into electric information
- H04N5/33—Transforming infrared radiation
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Abstract
The invention discloses a near-infrared system and method for automatically adjusting integral time. A more efficient and flexible integral time adjustment method is provided according to the response characteristics of an InGaAs detector about sun illumination and night airglow. When adaptive adjustment is carried out, adjustment of frame frequency is considered to adapt to the large-scale response characteristics of the InGaAs detector under different illumination conditions. Through judgment of information of a response value histogram, two speeds are adopted for speed adjustment to meet the requirements for efficiency and user experience simultaneously.
Description
Technical field
The present invention relates to a kind of near infrared imaging system based on InGaAs detectors, adjusts in real time under different illumination conditions
The whole time of integration, output video all-the-time stable is made in suitable brightness range, be unlikely to overexposure or image is gloomy.
Background technology
InGaAs detector image-formings wave band has benefited from natural radiation of the nightglow in short infrared wave band in 0.9-1.7um
Decades of times is better than radiation of the night sky in visible ray and near infrared band, and short-wave infrared imaging device utilizes near-infrared atmospheric window
Wave band can be very good to realize the observation to target in haze weather, effective to improve the target observation under severe weather conditions
Distance and effect.
Between near infrared band imaging characteristicses, illumination is particularly solar irradiation for detector image-forming affects very big, white
There is very big difference the time of integration that it and snooperscope imaging need.And in imaging on daytime also because climate reasons pair
There are the different times of integration to require in fine day, cloudy day, haze sky, sleety weather.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of near-infrared system and method for automatically adjusting the time of integration, no
Only can with the Automatic adjusument time of integration, can with Automatic adjusument frame frequency, make near-infrared system no matter daytime, night or
Picture rich in detail can be presented in fine day, haze sky.
In order to solve the technical problem, the technical solution used in the present invention is：It is a kind of to automatically adjust the near of the time of integration
Infrared system, including InGaAs detectors, detector output signal analysis module, time of integration adjustment module and frame frequency regulation mould
Block, the input of detector output signal analysis module is connected with the output end of InGaAs detectors, detector output signal point
The output end of analysis module is connected respectively with time of integration adjustment module and frame frequency adjustment module, detector output signal analysis module
The output signal of InGaAs detectors is analyzed and processes and output signal to time of integration adjustment module and frame frequency adjusts mould
Block, time of integration adjustment module and frame frequency adjustment module are adjusted according to the signal for receiving to the time of integration and frame frequency.
The near-infrared system for automatically adjusting the time of integration of the present invention, also including the 1550nm laser instruments of light filling,
1550nm laser instruments are connected with detector.
The near-infrared system for automatically adjusting the time of integration of the present invention, the time of integration adjustment module includes coarse adjustment mould
Block, fine tuning module, coarse adjustment module adjusts the time of integration in units of ms, and fine tuning module adjusts the time of integration in units of 100ns.
The near-infrared system for automatically adjusting the time of integration of the present invention, the Output Signal Analysis module includes connecting successively
Interframe smothing filtering module, statistics with histogram module, time-domain filtering module and the explorer response value judge module for connecing, interframe is put down
Sliding filtration module input is connected with InGaAs detectors, and output end and the time of integration of explorer response value judge module are adjusted
Module is connected.
The invention also discloses a kind of method for automatically adjusting the time of integration based on above-mentioned near-infrared system, InGaAs spies
Device collection surrounding environment image is surveyed, detector output signal analysis module is analyzed process and vector product to the image for collecting
Between timesharing adjustment module and frame frequency adjustment module output analysis result, then time of integration adjustment module according to receive signal to product
It is adjusted between timesharing, while frame frequency adjustment module is adjusted to frame frequency；Frame frequency adjustment process be：Frame frequency adjustment module is sentenced
Break and the intensity of signal output and signal output whether there is in the most long time of integration under 50hz frame frequencies, if without signal output or
Signal reads intensity can not meet imaging requirements, then reduce persistently judging in frame frequency, and the most long time of integration under the frame frequency
Signal reads whether intensity meets imaging requirements, continues to reduce frame frequency if it can not meet imaging requirements, until signal reads by force
Degree can meet imaging requirements or the time of integration reach it is most long.
The method for automatically adjusting the time of integration of the present invention, detector output signal analysis module is carried out to gathering image
The process of analyzing and processing is:Detector output signal first to receiving carries out frame filter；Then analyze per two field picture
Histogram is simultaneously counted, and histogram is proportional with response, judges detector within certain time of integration according to statistical conditions
Whole Response；Finally take out response highest 20% to judge the tonal range of current response.
The method for automatically adjusting the time of integration of the present invention, carries out time domain filter when explorer response value judges
Ripple, the image to collecting carries out pretreatment judgement.
The method for automatically adjusting the time of integration of the present invention, time of integration adjusting module adjusts the process of the time of integration
For：The threshold range of S01, setting gray value, the tonal range of current response is compared with the threshold range of setting, is judged
Image is normal condition, saturation state or unsaturated state；If S02, image are normal condition, the time of integration does not adjust, if figure
As then successively decreasing to the time of integration for saturation state, until image is normal condition, such as image is unsaturated state, then when to integration
Between be incremented by, until image be normal condition.
The method for automatically adjusting the time of integration of the present invention, in explorer response value completely without difference and excursion
Too fast interval, time of integration adjustment module carries out quick regulation, and the time of integration is adjusted in units of ms；Ring in detector
Slowly varying interval should be worth, time of integration adjustment module carries out fine adjustments, and the time of integration is adjusted in units of 100ns
Section.
The method for automatically adjusting the time of integration of the present invention, under the conditions of completely black, increases the 1550nm laser of no red light
Device light filling.
Beneficial effects of the present invention：When the present invention can automatically adjust integration according to the tonal range of explorer response value
Between, while in order to adapt to InGaAs detectors suitable for large-scale response characteristic under different illumination conditions, in Automatic adjusument
Frame frequency is adjusted while the time of integration, makes no matter near-infrared system can be presented clearly at daytime, night or in fine day, haze sky
Clear image.The present invention is more efficient more flexible, while considering to adjust efficiency and image flicker phenomenon, increases time-domain filtering function,
And regulations speed is controlled, it is to avoid image flicker phenomenon, and improve regulation efficiency.In order to ensure it is completely black under the conditions of imaging
Effect, increases laser instrument light filling or frame frequency adjusts adjustment module so as to remain to meet imaging requirements under the conditions of completely black.
Description of the drawings
Fig. 1 is the theory diagram of existing near infrared imaging system；
Fig. 2 is the theory diagram of the near-infrared system for automatically adjusting the time of integration；
Fig. 3 is the theory diagram of detector output signal analysis module.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is further limited with specific embodiment.
Embodiment 1
As shown in figure 1, for the theory diagram of existing near infrared imaging system, the near infrared imaging system includes what is be sequentially connected
Detector, AD conversion chip, main control chip and video coding chip, detector collection analog video signal and output valve AD conversion
Chip, AD conversion chip carries out analog-to-digital conversion to analog video signal, and output digital video signal, main control chip adopts FPGA,
Mainly complete a series of Video processing mistakes such as the output of near infrared detector drive signal, the framing of vision signal, nonuniformity correction
Journey, the vision signal after final output coding, outputting standard pal video after vision signal mirror video coding chip coding.It is existing
There is signal of the near infrared imaging system to collecting in main control chip to be nursed one's health, standard pal mode is exported, main control chip is needed
The video capturing rates of 50Hz are wanted, there are the 20ms times per frame.Integration, reading, the group of data for completing detector is needed in 20ms
Frame and subsequent treatment.Its time of integration is fixed within 20ms, it is impossible to be integrated the time according to different illumination conditions
Adjustment, affects imaging effect.
A kind of near-infrared system that can automatically adjust the time of integration disclosed in the present embodiment, including InGaAs detectors,
Detector output signal analysis module, time of integration adjustment module and frame frequency adjustment module, detector output signal analysis module
Input be connected with the output end of InGaAs detectors, the output end of detector output signal analysis module respectively with integration when
Between adjustment module be connected with frame frequency adjustment module, detector output signal analysis module is entered to the output signal of InGaAs detectors
Row analyzing and processing simultaneously outputs signal to time of integration adjustment module and frame frequency adjustment module, and time of integration adjustment module and frame frequency are adjusted
Section module is adjusted according to the signal for receiving to the time of integration and frame frequency.
For nighttime imaging effect, under the conditions of completely black, even if will be added to the time of integration most long, also cannot detect effectively
Information.The 1550nm laser instrument light fillings of no red light can now be added, the region that illuminated with laser light is imaged on after light filling is very bright, in laser
Region outside irradiation can be dark, even if but now the time of integration reach it is most long still cannot obtain effective information in dark space, because
This only considers laser light filling region.
In the present embodiment, the time of integration adjustment module includes coarse adjustment module, fine tuning module, and coarse adjustment module is with ms as list
Position adjusts the time of integration, and fine tuning module adjusts the time of integration in units of 100ns.By controlling to adjust speed, tune can be improved
Section efficiency, while avoiding image flicker phenomenon.
In the present embodiment, the Output Signal Analysis module includes interframe smothing filtering module, the histogram being sequentially connected
Statistical module, time-domain filtering module and explorer response value judge module, interframe smothing filtering module input is visited with InGaAs
Survey device to be connected, the output end of explorer response value judge module is connected with time of integration adjustment module.
Embodiment 2
A kind of method for automatically adjusting the time of integration is disclosed in the present embodiment, the method is by InGaAs detectors collection surrounding
Ambient image, detector output signal analysis module is pre-processed to the image for collecting, and is then believed according to statistic histogram
Breath is adjusted to the time of integration.Consider the adjustment of frame frequency simultaneously in self-adaptative adjustment, fitted with adapting to InGaAs detectors
For large-scale response characteristic under different illumination conditions.For regulating the speed, by the judgement to response histogram information,
Meet the requirement of efficiency and Consumer's Experience simultaneously using two kinds of speed.
Specially：S01, first InGaAs detectors gather surrounding environment image, detector output signal analysis module pair
The detector output signal for receiving carries out frame filter；The histogram of S02 and then statistics with histogram module analysis per two field picture
And count, histogram is proportional with response, and according to statistical conditions entirety of the detector within certain time of integration is judged
Response；S03, might have bad point etc. in itself in view of chip and respond abnormal point, highest response is taken merely and be might have
Erroneous judgement, therefore take out the tonal range for responding highest 20% to judge current response；The threshold value model of S04, setting gray value
Enclose, in the present embodiment, set high scope threshold value as the corresponding gray values of 3.5V, low range threshold is the corresponding gray values of 1.5V,
The tonal range of current response is compared with the threshold range of setting, image is judged for normal condition, saturation state or non-
Saturation state；If S05, image are normal condition, the time of integration does not adjust, and the time of integration is passed if image is saturation state
Subtract, until image is normal condition, such as image is unsaturated state, then the time of integration is incremented by, until image is normal condition.
In view of the requirement of the real-time adjustment time of integration, if all being judged or being processed per two field picture, governing speed
It is too fast, adjust excessively sensitive, in scene monitoring video may be made scintillation occur.It is unfavorable if governing speed is excessively slow
In real-time monitored, the meaning of real-time regulation is lost；Therefore time-domain filtering function is added when explorer response value judges, it is right
The image for collecting carries out pretreatment judgement.
When being adjusted, regulations speed is controlled according to the histogram feedback information after regulation.To improve
Efficiency is adjusted, while image flicker phenomenon is considered, it is too fast completely without difference and excursion in the output of explorer response value
Interval carry out quick regulation, the time of integration is changed in units of ms；Fine adjustments are carried out in slow change, tune now
Section speed can slowly, and the time of integration is adjusted in units of 100ns.
For nighttime imaging effect, under the conditions of completely black, even if will be added to the time of integration most long, also cannot detect effectively
Information.The 1550nm laser instrument light fillings of no red light can now be added, the region that illuminated with laser light is imaged on after light filling is very bright, in laser
Region outside irradiation can be dark, even if but now the time of integration reach it is most long still cannot obtain effective information in dark space, because
This only considers laser light filling region.This is also high only with reference to response when considering the accumulative effect of histogram why above
20% is judged.
For night monitoring, situation when adding laser light filling is not considered, add for completely black scene and adjust simultaneously frame frequency mould
Block.The imaging characteristic of research InGaAs detectors, the time of integration needs to be adjusted in 0-40ms even longer scope.In light on daytime
In the case of abundance, the time of integration only needs 1ms even shorter；Under night non-illuminated conditions, the time of integration needs to adjust
To 40ms.Obviously, the time of integration of 40ms cannot output frame for 50Hz vision signal, therefore using adaptively changing frame frequency
Method meeting the requirement of the time of integration, the following is the frame frequency and correspondence time of integration relation of the system.
The frame frequency of table 1 and time of integration corresponding relation
| Frame frequency | 50Hz | 25Hz | 12.5Hz |
| Time of integration adjustable range | 0-2.6ms | 0-20ms | 0-40ms |
In histogram deterministic process, if the most long time of integration under 50Hz frame frequencies cannot detect signal output, by frame
Frequency is reduced to 25Hz and starts to judge that signal reads intensity from the most long time of integration automatically, and whether continuation judges that the intensity of signal is seen and can
Meet imaging requirements, needs continue to reduce requirement of the frame frequency to reach the time of integration if it can not meet.More than judge until
The time of integration can meet imaging requirements, or the time of integration reach it is most long.
The present invention can automatically adjust the time of integration according to the tonal range of explorer response value, while in order to adapt to
InGaAs detectors are applied under different illumination conditions response characteristic on a large scale, adjust while the Automatic adjusument time of integration
Section frame frequency, makes no matter near-infrared system can be presented picture rich in detail at daytime, night or in fine day, haze sky.The present invention is more
It is efficiently more flexible, while considering to adjust efficiency and image flicker phenomenon, increase time-domain filtering function, and regulations speed is carried out
Control, it is to avoid image flicker phenomenon, and improve regulation efficiency.In order to ensure it is completely black under the conditions of imaging effect, increase laser instrument
Light filling or frame frequency adjust adjustment module so as to remain to meet imaging requirements under the conditions of completely black.
Described above is only the general principle and preferred embodiment of the present invention, and those skilled in the art do according to the present invention
The improvement for going out and replacement, belong to protection scope of the present invention.
Claims (10)
1. a kind of near-infrared system for automatically adjusting the time of integration, it is characterised in that：Including InGaAs detectors, detector output
Signal analysis module, time of integration adjustment module and frame frequency adjustment module, the input of detector output signal analysis module with
The output end of InGaAs detectors is connected, the output end of detector output signal analysis module respectively with time of integration adjustment module
It is connected with frame frequency adjustment module, detector output signal analysis module is analyzed process to the output signal of InGaAs detectors
And output signal to time of integration adjustment module and frame frequency adjustment module, time of integration adjustment module and frame frequency adjustment module according to
The signal of reception is adjusted respectively to the time of integration and frame frequency.
2. the near-infrared system for automatically adjusting the time of integration according to claim 1, it is characterised in that：Also including light filling
1550nm laser instruments, 1550nm laser instruments are connected with detector.
3. the near-infrared system for automatically adjusting the time of integration according to claim 1, it is characterised in that：The time of integration
Adjustment module includes coarse adjustment module, fine tuning module, and coarse adjustment module adjusts the time of integration in units of ms, and fine tuning module is with 100ns
The time of integration is adjusted for unit.
4. the near-infrared system for automatically adjusting the time of integration according to claim 1, it is characterised in that：The output signal
Analysis module includes that the interframe smothing filtering module, statistics with histogram module, time-domain filtering module and the detector that are sequentially connected ring
Judge module should be worth, interframe smothing filtering module input is connected with InGaAs detectors, explorer response value judge module
Output end is connected with time of integration adjustment module.
5. a kind of method for automatically adjusting the time of integration based on near-infrared system described in claim 1, it is characterised in that：
InGaAs detectors gather surrounding environment image, and detector output signal analysis module is analyzed place to the image for collecting
Reason simultaneously exports analysis result to time of integration adjustment module and frame frequency adjustment module, and then time of integration adjustment module is according to reception
Signal is adjusted to the time of integration, while frame frequency adjustment module is adjusted to frame frequency；Frame frequency adjustment process be：Frame frequency is adjusted
The intensity that signal output and signal output are whether there is in the most long time of integration that module is judged under 50hz frame frequencies is saved, if without signal
Output or signal read intensity can not meet imaging requirements, then reduce in frame frequency, and the most long time of integration under the frame frequency
Persistently judge that signal reads whether intensity meets imaging requirements, continue to reduce frame frequency if it can not meet imaging requirements, until letter
Number read intensity can meet imaging requirements or the time of integration reach it is most long.
6. the method for automatically adjusting the time of integration according to claim 5, it is characterised in that：Detector output signal is analyzed
Module is analyzed the process of process to gathering image:Detector output signal first to receiving carries out frame filter；
Then analyze the histogram per two field picture and count, histogram is proportional with response, judged to detect according to statistical conditions
Whole Response of the device within certain time of integration；Finally take out response highest 20% to judge the tonal range of current response.
7. the method for automatically adjusting the time of integration according to claim 6, it is characterised in that：Judge in explorer response value
When carry out time-domain filtering, the image to collecting carries out pretreatment judgement.
8. the method for automatically adjusting the time of integration according to claim 6, it is characterised in that：Time of integration adjusting module is adjusted
Section the time of integration process be：The threshold range of S01, setting gray value, by the tonal range of current response and the threshold for setting
Value scope is compared, and judges image for normal condition, saturation state or unsaturated state；If S02, image are normal condition, product
Do not adjust between timesharing, the time of integration is successively decreased if image is saturation state, until image is normal condition, such as image is non-full
And state, then the time of integration is incremented by, until image is normal condition.
9. the method for automatically adjusting the time of integration according to claim 6 or 8, it is characterised in that：In explorer response value
Completely without the interval that difference and excursion are too fast, time of integration adjustment module carries out quick regulation, and the time of integration is with ms
Unit is adjusted；In the slowly varying interval of explorer response value, time of integration adjustment module carries out fine adjustments, during integration
Between be adjusted in units of 100ns.
10. the method for automatically adjusting the time of integration according to claim 5, it is characterised in that：Under the conditions of completely black, increase
The 1550nm laser instrument light fillings of no red light.
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Application publication date: 20170510 |